///////////////////////////////////////////////////////////////////////////////
// BSD 3-Clause License
//
// Copyright (c) 2019, Nefelus Inc
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice, this
//   list of conditions and the following disclaimer.
//
// * Redistributions in binary form must reproduce the above copyright notice,
//   this list of conditions and the following disclaimer in the documentation
//   and/or other materials provided with the distribution.
//
// * Neither the name of the copyright holder nor the names of its
//   contributors may be used to endorse or promote products derived from
//   this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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#pragma once

#include "ZObject.h"
#include "odb.h"

namespace odb {

class ZContext;
class ZObject;
class ZFactory;

///
/// ZFactory - Class factory interface
///
class ZFactory
{
 public:
  //
  // Return values:
  //    Z_OK - Object created
  //    Z_ERROR_NO_INTERFACE - Object not created because it does not
  //                           support the specified interface.
  //
  virtual int create(const ZContext& context, ZInterfaceID iid, void** p) = 0;
};

///
/// ZFactoryImpl - A singleton class which creates instances of the
/// implementation class.
///
template <class IMPL, class INFC>
class ZFactoryImpl : public ZFactory
{
 public:
  int create(const ZContext& context, ZInterfaceID iid, void** p)
  {
    IMPL* o     = new IMPL;
    o->_context = context;

    if (o->QueryInterface(iid, p) == Z_OK)
      return Z_OK;

    delete o;
    *p = NULL;
    return Z_ERROR_NO_INTERFACE;
  }
};

}  // namespace odb


